JPH09258619A - Power source circuit for printer device - Google Patents
Power source circuit for printer deviceInfo
- Publication number
- JPH09258619A JPH09258619A JP8091918A JP9191896A JPH09258619A JP H09258619 A JPH09258619 A JP H09258619A JP 8091918 A JP8091918 A JP 8091918A JP 9191896 A JP9191896 A JP 9191896A JP H09258619 A JPH09258619 A JP H09258619A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- output
- outside
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/80—Details relating to power supplies, circuits boards, electrical connections
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
- G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
- G03G15/1675—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer with means for controlling the bias applied in the transfer nip
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プリンタ装置等に
用いられる電源回路に関するものであり、特に、そのよ
うな電源回路の出力電流を制御する技術に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit used in a printer or the like, and more particularly to a technique for controlling an output current of such a power supply circuit.
【０００２】[0002]
【従来の技術】従来から、コンピュータ等で作成した文
章や画像を印刷するプリンタ装置として、電子写真プリ
ンタ装置が広く使用されている。図７は、その電子写真
プリンタ装置の構成を示す図である。文章や画像を印刷
する場合には、最初に、帯電ローラが、マイナスの電荷
を印加することにより、回転する感光ドラムをマイナス
の電荷に帯電させる。次に、ＬＥＤ等の光源が、その感
光ドラムに光を照射することにより、印刷しようとする
文章や画像の静電潜像を作成する。そして、現像器が、
その静電潜像に対し、マイナスに帯電したトナーを付着
させて現像する。さらに、転写用電源からプラス電圧を
印加されている転写ローラが、静電気力によって、感光
ドラムに付着しているトナーを用紙へ転写している。こ
こで、良好な状態で転写するには、トナーを感光ドラム
上から用紙上へ転写する静電気力を一定に保つ必要があ
る。従って、例えば、転写ローラのインピーダンスや用
紙のインピーダンスが変化した場合には、それらの変化
によって静電気力が変わってしまわないように、転写ロ
ーラに印加する電圧を補正する必要がある。2. Description of the Related Art Conventionally, an electrophotographic printer device has been widely used as a printer device for printing sentences and images created by a computer or the like. FIG. 7 is a diagram showing the configuration of the electrophotographic printer device. When printing a text or an image, first, the charging roller applies a negative charge to charge the rotating photosensitive drum to a negative charge. Next, a light source such as an LED irradiates the photosensitive drum with light to create an electrostatic latent image of a sentence or image to be printed. And the developing device
The electrostatic latent image is developed by attaching negatively charged toner. Further, the transfer roller, to which a positive voltage is applied from the transfer power source, transfers the toner adhering to the photosensitive drum onto the paper by electrostatic force. Here, in order to transfer in a good state, it is necessary to maintain a constant electrostatic force for transferring the toner from the photosensitive drum onto the paper. Therefore, for example, when the impedance of the transfer roller or the impedance of the paper is changed, it is necessary to correct the voltage applied to the transfer roller so that the electrostatic force is not changed by those changes.
【０００３】[0003]
【発明が解決しようとする課題】ところで、従来のプリ
ンタ装置等に使用される電源回路では、プリンタ装置の
設置環境、例えば、温度や湿度等が変化しても、一定値
の電流しか出力できない。従って、その定電流によって
定まる転写電圧が、その設置環境の下でのプリンタ装置
の印字条件に合致しない場合が生じる。図８は、プリン
タ装置の転写ローラに通電される電流と、その電流によ
り発生する転写電圧との関係を示す図である。図８にお
いて、曲線は、その設置環境におけるプリンタ装置の最
適な印字条件を示す。例えば、高温高湿の環境下では、
定電流Ｉｃを流すことにより、転写電圧Ｖｈが生起す
る。この転写電圧Ｖｈは、最適な印字条件Ｃｈの範囲内
に位置するので、良好に転写される。同様にして、常温
の環境下では、定電流Ｉｃを流すことにより、転写電圧
Ｖｎが生起する。この転写電圧Ｖｎは、最適な印字条件
Ｃｎの範囲内に位置するので、良好に転写される。一
方、低温低湿の環境下では、定電流Ｉｃを流すことによ
り、転写電圧Ｖｌが生起する。しかし、この転写電圧Ｖ
ｌは、最適な印字条件Ｃｌの範囲内に位置せず、必要以
上に高い電圧となる。従って、この転写電圧Ｖｌの下で
は、不良な転写となってしまうという問題があった。By the way, in the power supply circuit used in the conventional printer device or the like, even if the installation environment of the printer device, for example, temperature or humidity changes, only a constant current can be output. Therefore, the transfer voltage determined by the constant current may not match the printing conditions of the printer device under the installation environment. FIG. 8 is a diagram showing the relationship between the current supplied to the transfer roller of the printer and the transfer voltage generated by the current. In FIG. 8, a curved line shows the optimum printing condition of the printer device in the installation environment. For example, in an environment of high temperature and high humidity,
The transfer voltage Vh is generated by passing the constant current Ic. This transfer voltage Vh is positioned within the range of the optimum printing condition Ch, so that the transfer is performed well. Similarly, under normal temperature environment, the transfer voltage Vn is generated by passing the constant current Ic. Since the transfer voltage Vn is located within the range of the optimum printing condition Cn, the transfer is performed well. On the other hand, under the environment of low temperature and low humidity, the transfer voltage Vl is generated by flowing the constant current Ic. However, this transfer voltage V
l is not located within the range of the optimum printing condition Cl, and has a voltage higher than necessary. Therefore, there is a problem that the transfer becomes defective under the transfer voltage Vl.
【０００４】[0004]
【課題を解決するための手段】本発明は、以上の問題点
を解決するために、次の構成を採用する。 〈構成〉本発明のプリンタ装置の電源回路は、外部へ出
力する電流の基準値を定める基準電流設定部と、外部へ
電流を出力するための出力電圧を生成する電圧生成部
と、出力電圧を監視する電圧監視部と、基準電流設定部
によって定められた基準電流と、電圧監視部によって監
視された出力電圧とから、外部へ出力すべき電流の値を
算出する演算部と、演算部によって算出された結果に基
づいて、電圧生成部を制御する電流制御部とからなり、
監視された出力電圧が大きければ大きいほど、外部へ出
力すべき電流の値を小さくすることを特徴とする。The present invention employs the following structure in order to solve the above problems. <Structure> The power supply circuit of the printer of the present invention includes a reference current setting unit that determines a reference value of a current to be output to the outside, a voltage generation unit that generates an output voltage to output the current to the outside, and an output voltage. A voltage monitoring unit for monitoring, a reference current set by the reference current setting unit, and an output unit monitored by the voltage monitoring unit for calculating the value of the current to be output to the outside. And a current control unit that controls the voltage generation unit based on the result of
The larger the monitored output voltage, the smaller the value of the current to be output to the outside.
【０００５】〈構成の内容〉以下、構成の内容について
説明する。基準電流設定部とは、外部へ出力する電流の
基準値を定める、例えば、オペアンプや可変抵抗等から
なる回路をいう。電圧生成部とは、外部へ出力するため
の出力電圧を生成する、例えば、トランス等からなる回
路をいう。電圧監視部とは、出力電圧を監視する、例え
ば、オペアンプ等からなる回路をいう。演算部とは、外
部へ出力すべき電流の値を算出する、例えば、オペアン
プやＣＰＵ等からなる回路をいう。電流制御部とは、電
圧生成部を制御する、例えば、トランジスタ等からなる
回路をいう。<Contents of Configuration> The contents of the configuration will be described below. The reference current setting unit refers to a circuit including an operational amplifier, a variable resistor, or the like, which determines a reference value of a current output to the outside. The voltage generator is a circuit that generates an output voltage to be output to the outside, and includes, for example, a transformer. The voltage monitoring unit refers to a circuit configured to monitor the output voltage, such as an operational amplifier. The arithmetic unit is a circuit for calculating the value of the current to be output to the outside, which is composed of, for example, an operational amplifier or a CPU. The current control unit refers to a circuit that controls the voltage generation unit and that includes, for example, a transistor.
【０００６】〈作用、効果〉本発明のプリンタ装置の電
源回路では、電源回路から外部へ出力される出力電圧を
監視し、その監視された出力電圧に基づき出力電流を変
化させることにより、所望の電圧を生成している。従っ
て、本発明のプリンタ装置の電源回路によれば、環境の
相違、用紙のインピーダンスの相違、転写ローラの電気
抵抗の相違等に対応した、最適な印字電圧を生成するこ
とが可能となる。<Operations and Effects> In the power supply circuit of the printer of the present invention, the output voltage output from the power supply circuit to the outside is monitored, and the output current is changed based on the monitored output voltage. Generating voltage. Therefore, according to the power supply circuit of the printer of the present invention, it is possible to generate an optimum printing voltage corresponding to a difference in environment, a difference in sheet impedance, a difference in electric resistance of the transfer roller, and the like.
【０００７】[0007]
【発明の実施の形態】以下、本発明の電源回路を実施の
形態に沿って説明する。 〈具体例１の構成〉図１は、具体例１の電源回路のブロ
ック図である。この電源回路ＰＳは、基準電流設定部Ｒ
Ｃ、電圧監視部ＶＭ、電流監視部ＣＭ、演算部Ｅ、電流
制御部Ｃ、電圧生成部ＶＧから構成されている。基準電
流設定部ＲＣは、出力電流の基準値を設定する機能を有
する。電圧監視部ＶＭは、出力電圧の状態を帰還させる
機能を有する。電流監視部ＣＭは、出力電流の状態を帰
還させる機能を有する。演算部Ｅは、基準電流設定部Ｒ
Ｃに設定された電流値と、電圧監視部ＶＭが監視する出
力電圧とに基づき、後述する図３のような電圧電流特性
から出力すべき電流値を演算する機能を有する。電流制
御部Ｃは、演算部Ｅによって演算された電流値に基づい
て電圧生成部ＶＧを制御する機能を有する。電圧生成部
ＶＧは、電流制御部Ｃによる制御の下に、電圧を外部へ
出力する。BEST MODE FOR CARRYING OUT THE INVENTION The power supply circuit of the present invention will be described below with reference to embodiments. <Structure of Concrete Example 1> FIG. 1 is a block diagram of a power supply circuit of Concrete Example 1. This power supply circuit PS includes a reference current setting unit R
C, a voltage monitoring unit VM, a current monitoring unit CM, a calculation unit E, a current control unit C, and a voltage generation unit VG. The reference current setting unit RC has a function of setting a reference value of the output current. The voltage monitoring unit VM has a function of feeding back the state of the output voltage. The current monitoring unit CM has a function of feeding back the state of the output current. The calculation unit E is a reference current setting unit R
Based on the current value set in C and the output voltage monitored by the voltage monitoring unit VM, it has a function of calculating the current value to be output from the voltage-current characteristic as shown in FIG. 3 described later. The current controller C has a function of controlling the voltage generator VG based on the current value calculated by the calculator E. The voltage generator VG outputs the voltage to the outside under the control of the current controller C.
【０００８】図２は、図１の電源回路のブロック図に対
応する回路図である。この電源回路ＰＳにおいて、基準
電流設定部ＲＣは、オペアンプｏｐ１０、可変抵抗ｒｖ
１０等から構成される。電圧監視部ＶＭは、オペアンプ
ｏｐ２０、抵抗ｒ２０、２１、２２、２３、ダイオード
Ｄ２０等から構成される。電流監視部ＣＭは、抵抗ｒ３
０等から構成されている。演算部Ｅは、オペアンプｏｐ
４０、抵抗ｒ４０、４１、４２、４３、４４、４５等か
ら構成される。電流制御部Ｃは、オペアンプｏｐ５０、
トランジスタＴｒ５０、抵抗ｒ５０等から構成される。
電圧生成部ＶＧは、トランスＴ６０等から構成される。FIG. 2 is a circuit diagram corresponding to the block diagram of the power supply circuit of FIG. In this power supply circuit PS, the reference current setting unit RC includes an operational amplifier op10 and a variable resistor rv.
It is composed of 10 etc. The voltage monitoring unit VM includes an operational amplifier op20, resistors r20, 21, 22, 23 and a diode D20. The current monitoring unit CM has a resistor r3.
0 and so on. The arithmetic unit E is an operational amplifier op.
40, resistors r40, 41, 42, 43, 44, 45 and the like. The current control unit C includes an operational amplifier op50,
It is composed of a transistor Tr50, a resistor r50, and the like.
The voltage generator VG includes a transformer T60 and the like.
【０００９】〈動作の説明〉図３は、具体例１の電源回
路における、出力すべき電圧と出力すべき電流との関係
を示す図である。ここで、Ｃｈ、Ｃｎ、Ｃｌは、それぞ
れ各環境での最適な印字条件を示し、また、Ｓは、電圧
電流特性を示す。以下、具体例１の電源回路の動作を図
２の回路図と図３の電圧電流特性とに沿って説明する。
基準電流設定部ＲＣでは、印刷する用紙サイズに最適な
基準電流Ｉｒを流すべく、可変抵抗ｒｖ１０を調整し、
基準電圧Ｖｒを定める。調整された電圧は、演算部Ｅへ
出力される。電圧監視部ＶＭでは、出力電圧の電圧値を
モニターするべく、トランス６０に誘起された電圧をダ
イオードＤ２０によって整流した後に、オペアンプｏｐ
２０を介して演算部Ｅへ、モニター電圧Ｖｍとして出力
する。演算部Ｅでは、基準電流設定部ＲＣの基準電圧Ｖ
ｒと電圧監視部ＶＭのモニター電圧Ｖｍとを加算する
（実際には、基準電流Ｉｒ−ａ・Ｖｍの演算を行い、Ｖ
ｍの値に応じて補正された出力電流値を示す補正基準電
圧ΔＶを求めることを意味する）。そして、演算部Ｅ
は、この補正基準電圧ΔＶを電流制御部Ｃへ出力する。<Description of Operation> FIG. 3 is a diagram showing the relationship between the voltage to be output and the current to be output in the power supply circuit of the first specific example. Here, Ch, Cn, and Cl indicate optimum printing conditions in each environment, and S indicates voltage-current characteristics. Hereinafter, the operation of the power supply circuit of the first specific example will be described with reference to the circuit diagram of FIG. 2 and the voltage-current characteristics of FIG.
In the reference current setting unit RC, the variable resistance rv10 is adjusted so that the reference current Ir optimal for the size of the paper to be printed flows.
The reference voltage Vr is determined. The adjusted voltage is output to the arithmetic unit E. In the voltage monitoring unit VM, in order to monitor the voltage value of the output voltage, the voltage induced in the transformer 60 is rectified by the diode D20 and then the operational amplifier op.
The monitor voltage Vm is output to the arithmetic unit E via 20. In the calculation unit E, the reference voltage V of the reference current setting unit RC
r is added to the monitor voltage Vm of the voltage monitoring unit VM (actually, the reference current Ir-a · Vm is calculated to obtain V
It means obtaining a correction reference voltage ΔV indicating the output current value corrected according to the value of m). And the arithmetic unit E
Outputs the corrected reference voltage ΔV to the current controller C.
【００１０】電流制御部Ｃでは、オペアンプｏｐ５０の
マイナス端子に上記の補正基準電圧ΔＶが入力される一
方で、電流監視部ＣＭによってモニターされる出力電流
を電圧へ換算し、この換算された電圧Ｖｃが、オペアン
プｏｐ５０のプラス端子に入力される。このオペアンプ
ｏｐ５０は、コンパレータとして機能し、トランジスタ
Ｔｒ５０をオンにすることにより、出力電流を増加さ
せ、反対に、トランジスタＴｒ５０をオフにすることに
より、出力電流を減少させる。ここで、ｏｐ５０のプラ
ス端子の入力に関し、出力電流が多く流れるほど、抵抗
ｒ３０による電圧降下は大きくなるので、電圧Ｖｃは小
さくなり、逆に、少なく流れるほど、電圧降下は小さく
なるので、電圧Ｖｃは大きくなる。In the current control section C, while the above-mentioned corrected reference voltage ΔV is inputted to the negative terminal of the operational amplifier op50, the output current monitored by the current monitoring section CM is converted into a voltage, and this converted voltage Vc Is input to the positive terminal of the operational amplifier op50. The operational amplifier op50 functions as a comparator, and turns on the transistor Tr50 to increase the output current, and conversely turns off the transistor Tr50 to decrease the output current. Here, regarding the input to the plus terminal of op50, the larger the output current flows, the larger the voltage drop due to the resistor r30, and thus the smaller the voltage Vc, and conversely, the smaller the flow, the smaller the voltage drop becomes. Grows.
【００１１】このように構成することにより、ｏｐ５０
の入力である補正基準電圧ΔＶに対して、電圧Ｖｃが小
さいと、トランジスタＴｒ５０をオフにするｌｏｗレベ
ル（Ｇｎｄ）を出力し、反対に、補正基準電圧ΔＶに対
して、電圧Ｖｃが大きいと、トランジスタＴｒ５０をオ
ンにするｈｉｇｈレベル（＋Ｖｃｃ）を出力する。With this configuration, op50
When the voltage Vc is small with respect to the correction reference voltage ΔV that is the input of, the low level (Gnd) that turns off the transistor Tr50 is output, and conversely, when the voltage Vc is large with respect to the correction reference voltage ΔV, A high level (+ Vcc) that turns on the transistor Tr50 is output.
【００１２】このように、補正基準電圧ΔＶに従って、
トランジスタＴｒ５０をオン／オフ制御することで、電
圧生成部ＶＧは、図３の電圧電流特性Ｓに沿って最適な
電圧を生成することができ、良好な印字をすることが可
能となる。Thus, according to the correction reference voltage ΔV,
By controlling the transistor Tr50 to be turned on / off, the voltage generator VG can generate an optimum voltage along the voltage-current characteristic S of FIG. 3, and good printing can be performed.
【００１３】〈具体例２の説明〉次に、具体例２の電源
回路について説明する。図４は、具体例２の電源回路の
ブロック図である。この電源回路ＰＳは、具体例１の電
源回路と同様に、基準電流設定部ＲＣ、電圧監視部Ｖ
Ｍ、電流監視部ＣＭ、演算部Ｅ、電流制御部Ｃ、電圧生
成部ＶＧから構成されているだけでなく、さらに、記憶
部Ｍを有している。各部は、必要に応じて、論理回路、
Ａ／Ｄコンバータ等を有している。特に、演算部Ｅは、
ＣＰＵ（Central Processing Unit ）、クロック発生器
等も有している。また、記憶部Ｍは、図３に示すような
電圧電流特性Ｓを記憶している。<Description of Specific Example 2> Next, a power supply circuit of specific example 2 will be described. FIG. 4 is a block diagram of the power supply circuit of the second specific example. This power supply circuit PS, like the power supply circuit of the first specific example, has a reference current setting unit RC and a voltage monitoring unit V.
M, a current monitoring unit CM, a calculation unit E, a current control unit C, and a voltage generation unit VG, and further includes a storage unit M. Each part has a logic circuit,
It has an A / D converter and the like. In particular, the arithmetic unit E
It also has a CPU (Central Processing Unit), a clock generator, and the like. The storage unit M also stores the voltage-current characteristic S as shown in FIG.
【００１４】〈動作の説明〉具体例１の動作と同様に、
基準電流設定部ＲＣで設定された基準電流値と電圧監視
部ＶＭでモニターされた出力電圧とから、出力すべき電
流値を演算により求める。電流値を求める際の演算式
は、図３の電圧電流特性Ｓを再現するように決定され
る。これにより、具体例１の場合と同様に、良好な転写
電圧を出力することが可能となる。<Description of Operation> Similar to the operation of the first specific example,
The current value to be output is calculated from the reference current value set by the reference current setting unit RC and the output voltage monitored by the voltage monitoring unit VM. The arithmetic expression for obtaining the current value is determined so as to reproduce the voltage-current characteristic S of FIG. This makes it possible to output a good transfer voltage as in the case of the first specific example.
【００１５】また、図５に示すように、用紙の幅が広い
場合の特性と、用紙の幅が狭い場合の特性とを記憶部Ｍ
に記憶させる。これにより、用紙の幅が広いときであっ
ても、また、用紙の幅が狭いときであっても、より適し
た電圧電流特性を選択することが可能となる。従って、
様々な用紙に対し、より最適な転写電圧を出力すること
ができるようになる。As shown in FIG. 5, the storage unit M stores the characteristics when the width of the paper is wide and the characteristics when the width of the paper is narrow.
To memorize. This makes it possible to select a more suitable voltage-current characteristic even when the width of the paper is wide or when the width of the paper is narrow. Therefore,
It becomes possible to output a more optimal transfer voltage for various types of paper.
【００１６】さらに、図６に示すように、印刷時におけ
る電圧電流特性Ｓ１、Ｓ２とは別に、用紙が転写ローラ
と感光ドラムとの間に入るまでの電圧電流特性Ｔ１、Ｔ
２を記憶部Ｍに記憶しておき、用紙が転写ローラと感光
ドラムとの間に入る直前の電圧値と電流値とを検出・保
持する（図６における点ａ１、点ｂ１）。そして、印刷
する際には、印刷時の電圧電流特性Ｓ１、Ｓ２に基づ
き、転写電圧を制御する（図６における点ａ２、点ｂ
２）。これにより、ローラのインピーダンスや用紙のイ
ンピーダンスに対して、二段階に転写電流を制御するこ
とができる。従って、ローラのインピーダンスが、ロー
ラ毎にばらついていても、あるいは、用紙のインピーダ
ンスが用紙毎にばらついていても、より最適な出力特性
を選択できることになる。Further, as shown in FIG. 6, in addition to the voltage-current characteristics S1 and S2 at the time of printing, the voltage-current characteristics T1 and T until the sheet enters between the transfer roller and the photosensitive drum.
2 is stored in the storage unit M, and the voltage value and the current value immediately before the sheet enters between the transfer roller and the photosensitive drum are detected and held (points a1 and b1 in FIG. 6). When printing, the transfer voltage is controlled based on the voltage-current characteristics S1 and S2 at the time of printing (point a2 and point b in FIG. 6).
2). As a result, the transfer current can be controlled in two steps with respect to the impedance of the roller and the impedance of the paper. Therefore, even if the impedance of the roller varies from roller to roller, or even if the impedance of the sheet varies from sheet to sheet, more optimal output characteristics can be selected.
【図１】具体例１の電源回路のブロック図である。FIG. 1 is a block diagram of a power supply circuit according to a specific example 1.
【図２】具体例１の電源回路の回路図である。FIG. 2 is a circuit diagram of a power supply circuit according to a specific example 1.
【図３】具体例１の電源回路の電圧電流特性である。FIG. 3 is a voltage-current characteristic of the power supply circuit of the first specific example.
【図４】具体例２の電源回路のブロック図である。FIG. 4 is a block diagram of a power supply circuit according to a specific example 2.
【図５】具体例２の電源回路の電圧電流特性（その１）
である。FIG. 5: Voltage-current characteristics of power supply circuit of specific example 2 (part 1)
It is.
【図６】具体例２の電源回路の電圧電流特性（その２）
である。FIG. 6 is a voltage-current characteristic of the power supply circuit of the second specific example (part 2).
It is.
【図７】従来のプリンタ装置の構成図である。FIG. 7 is a configuration diagram of a conventional printer device.
【図８】従来の電源回路の電圧電流特性である。FIG. 8 is a voltage-current characteristic of a conventional power supply circuit.
ＰＳ 電源回路 ＲＣ 基準電流設定部 ＤＭ 電圧監視部 Ｅ 演算部 Ｃ 電流制御部 ＶＧ 電圧生成部 PS power supply circuit RC reference current setting unit DM voltage monitoring unit E computing unit C current control unit VG voltage generation unit
Claims (3)
準電流設定部と、 前記外部へ電流を出力するための出力電圧を生成する電
圧生成部と、 前記出力電圧を監視する電圧監視部と、 基準電流設定部によって定められた基準電流と、電圧監
視部によって監視された出力電圧とから、外部へ出力す
べき電流の値を算出する演算部と、 前記演算部によって算出された結果に基づいて、前記電
圧生成部を制御する電流制御部とからなり、 前記監視された出力電圧が大きければ大きいほど、前記
外部へ出力すべき電流の値を小さくすることを特徴とす
るプリンタ装置の電源回路。1. A reference current setting unit that determines a reference value of a current output to the outside, a voltage generation unit that generates an output voltage for outputting the current to the outside, and a voltage monitoring unit that monitors the output voltage. A calculation unit that calculates the value of the current to be output to the outside from the reference current determined by the reference current setting unit and the output voltage monitored by the voltage monitoring unit; and based on the result calculated by the calculation unit. And a current control unit for controlling the voltage generation unit, and the larger the monitored output voltage is, the smaller the value of the current to be output to the outside is. .
する出力電流との関係を示す電圧電流特性を記憶する記
憶部を有しており、制御部が、電圧監視部によって監視
された出力電圧を元にして、前記電圧電流特性から出力
すべき電流の値を算出することを特徴とする請求項１記
載のプリンタ装置の電源回路。2. A storage unit that stores a voltage-current characteristic indicating a relationship between a voltage output to the outside and an output current output to the outside, and the control unit outputs the output monitored by the voltage monitoring unit. 2. The power supply circuit for a printer device according to claim 1, wherein the value of the current to be output is calculated from the voltage-current characteristic based on the voltage.
力する電圧と外部へ出力する電流との関係を示す第一の
電圧電流特性と、印刷時において外部へ出力する電圧と
外部へ出力する電流との関係を示す複数の第二の電圧電
流特性とを予め記憶しており、 前記制御部が、印刷前において第一の電圧電流特性から
得た電圧値と電流値とを保持し、その電圧値と電流値と
に基づいて、複数の第二の電圧電流特性かの中から適当
な電圧電流特性を選択することを特徴とする請求項１記
載のプリンタ装置の電源回路。3. The storage unit outputs a first voltage-current characteristic indicating a relationship between a voltage output to the outside and a current output to the outside before printing, and a voltage output to the outside during printing. A plurality of second voltage-current characteristics indicating the relationship with the current are stored in advance, the control unit holds the voltage value and the current value obtained from the first voltage-current characteristics before printing, and 2. A power supply circuit for a printer device according to claim 1, wherein an appropriate voltage-current characteristic is selected from among a plurality of second voltage-current characteristics based on the voltage value and the current value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09191896A JP3737559B2 (en) | 1996-03-21 | 1996-03-21 | Printer apparatus and power supply circuit thereof |
| US08/821,943 US5814978A (en) | 1996-03-21 | 1997-03-21 | Power supply circuit for a printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09191896A JP3737559B2 (en) | 1996-03-21 | 1996-03-21 | Printer apparatus and power supply circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09258619A true JPH09258619A (en) | 1997-10-03 |
| JP3737559B2 JP3737559B2 (en) | 2006-01-18 |
Family
ID=14039972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09191896A Expired - Fee Related JP3737559B2 (en) | 1996-03-21 | 1996-03-21 | Printer apparatus and power supply circuit thereof |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5814978A (en) |
| JP (1) | JP3737559B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1195609A (en) * | 1997-09-24 | 1999-04-09 | Brother Ind Ltd | Energizing device for image forming device |
| JP2016173520A (en) * | 2015-03-18 | 2016-09-29 | 株式会社沖データ | Image forming apparatus and image forming method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4420247A (en) * | 1979-12-28 | 1983-12-13 | Canon Kabushiki Kaisha | Computer control means for an electrostatic recording apparatus |
| US5179397A (en) * | 1989-04-03 | 1993-01-12 | Canon Kabushiki Kaisha | Image forming apparatus with constant voltage and constant current control |
| JP2817391B2 (en) * | 1990-11-02 | 1998-10-30 | キヤノン株式会社 | Charging device |
| EP0520819B1 (en) * | 1991-06-28 | 1998-08-19 | Canon Kabushiki Kaisha | Image forming apparatus having charging member |
| JP2601974B2 (en) * | 1992-09-16 | 1997-04-23 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Power supply for electronic equipment and electronic equipment system |
| EP0647889B1 (en) * | 1993-10-08 | 1998-04-01 | Oki Electric Industry Co., Ltd. | Electrophotographic recording apparatus and method of transferring a toner image |
| US5684685A (en) * | 1994-05-06 | 1997-11-04 | Canon Kabushiki Kaisha | High voltage power supply for image transfer and image forming apparatus using the same |
| US5705919A (en) * | 1996-09-30 | 1998-01-06 | Linear Technology Corporation | Low drop-out switching regulator architecture |
-
1996
- 1996-03-21 JP JP09191896A patent/JP3737559B2/en not_active Expired - Fee Related
-
1997
- 1997-03-21 US US08/821,943 patent/US5814978A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3737559B2 (en) | 2006-01-18 |
| US5814978A (en) | 1998-09-29 |
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